
<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->

    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>

      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>

            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" href="/course">全部</a>
                </li>
                <li
                  v-for="(item, index) in subjectNestedList"
                  :key="index"
                  :class="{ active: oneIndex == index }"
                >
                  <a
                    :title="item.title"
                    @click="searchOne(item.id, index)"
                    href="#"
                    >{{ item.title }}</a
                  >
                </li>
              </ul>
            </dd>
          </dl>

          <dl>
            <dt>
              <span class="c-999 fsize14"></span>
            </dt>

            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li
                  v-for="(item, index) in subSubjectList"
                  :key="index"
                  @click="searchTwo(item.id, index)"
                  :class="{ active: twoIndex == index }"
                >
                  <a :title="item.title" href="#">{{ item.title }}</a>
                </li>
              </ul>
            </dd>
          </dl>

          <div class="clear"></div>
        </section>

        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/

              <i class="c-666 f-fM">1</i>
            </span>
          </section>

          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{ 'current bg-orange': buyCountSort != '' }">
                <a
                  title="销量"
                  href="javascript:void(0);"
                  @click="searchBuyCount()"
                  >销量

                  <span :class="{ hide: buyCountSort == '' }">↓</span>
                </a>
              </li>

              <li :class="{ 'current bg-orange': gmtCreateSort != '' }">
                <a
                  title="最新"
                  href="javascript:void(0);"
                  @click="searchGmtCreate()"
                  >最新

                  <span :class="{ hide: gmtCreateSort == '' }">↓</span>
                </a>
              </li>

              <li :class="{ 'current bg-orange': priceSort != '' }">
                <a
                  title="价格"
                  href="javascript:void(0);"
                  @click="searchPrice()"
                  >价格&nbsp;

                  <span :class="{ hide: priceSort == '' }">↓</span>
                </a>
              </li>
            </ol>
          </section>
        </div>

        <div class="mt40">
          <!-- /无数据提示 开始-->

          <section v-if="data.total == 0" class="no-data-wrap">
            <em class="icon30 no-data-ico">&nbsp;</em>

            <span class="c-666 fsize14 ml10 vam"
              >没有相关数据，小编正在努力整理中...</span
            >
          </section>

          <!-- /无数据提示 结束-->

          <article v-if="data.total > 0" class="comm-course-list">
            <ul class="of" id="bna">
              <li v-for="course in data.records" :key="course.id">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img
                      :src="course.cover"
                      class="img-responsive"
                      :alt="course.title"
                    />

                    <div class="cc-mask">
                      <a
                        :href="'/course/' + course.id"
                        title="开始学习"
                        class="comm-btn c-btn-1"
                        >开始学习</a
                      >
                    </div>
                  </section>

                  <h3 class="hLh30 txtOf mt10">
                    <a
                      :href="'/course/' + course.id"
                      :title="course.title"
                      class="course-title fsize18 c-333"
                      >{{ course.title }}</a
                    >
                  </h3>

                  <section class="mt10 hLh20 of">
                    <span
                      v-if="Number(course.price) === 0"
                      class="fr jgTag bg-green"
                    >
                      <i class="c-fff fsize12 f-fA"> 免费 </i>
                    </span>

                    <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">{{ course.buyCount }}人学习</i>

                      |

                      <i class="c-999 f-fA">{{ course.commentCount }}评论</i>
                    </span>
                  </section>
                </div>
              </li>
            </ul>

            <div class="clear"></div>
          </article>
        </div>

        <!-- 公共分页 开始 -->
        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->

            <a
              :class="{ undisable: !data.hasPrevious }"
              href="#"
              title="首页"
              @click.prevent="gotoPage(1)"
              >首</a
            >

            <a
              :class="{ undisable: !data.hasPrevious }"
              href="#"
              title="前一页"
              @click.prevent="gotoPage(data.current - 1)"
              >&lt;</a
            >

            <a
              v-for="page in data.pages"
              :key="page"
              :class="{
                current: data.current == page,
                undisable: data.current == page,
              }"
              :title="'第' + page + '页'"
              href="#"
              @click.prevent="gotoPage(page)"
              >{{ page }}</a
            >

            <a
              :class="{ undisable: !data.hasNext }"
              href="#"
              title="后一页"
              @click.prevent="gotoPage(data.current + 1)"
              >&gt;</a
            >

            <a
              :class="{ undisable: !data.hasNext }"
              href="#"
              title="末页"
              @click.prevent="gotoPage(data.pages)"
              >末页</a
            >

            <div class="clear" />
          </div>
        </div>
        <!-- 公共分页 结束 -->
      </section>
    </section>

    <!-- /课程列表 结束 -->
  </div>
</template>

<script>
import courseApi from "@/api/course/course";
export default {
  data() {
    return {
      page: 1, //当前页
      data: {}, //课程列表
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [], // 二级分类列表
      searchObj: {}, // 查询表单对象
      oneIndex: -1,
      twoIndex: -1,
      buyCountSort: "",
      gmtCreateSort: "",
      priceSort: "",
    };
  },
  created() {
    //课程第一次查询
    this.initCourseFirst();
    //一级分类显示
    this.initSubject();
  },
  methods: {
    //1.查询第一页数据
    initCourseFirst() {
      if (this.$route.query || this.$route.query.courseName) {
        this.searchObj.title = this.$route.query.courseName;
      }
      courseApi.getCourseList(1, 8, this.searchObj).then((res) => {
        this.data = res.data.data;
      });
    },
    //2.查询所有分类
    initSubject() {
      courseApi.getAllSubject().then((res) => {
        this.subjectNestedList = res.data.data.list;
      });
    },
    //3.分页切换的方法
    gotoPage(page) {
      courseApi.getCourseList(page, 8, this.searchObj).then((res) => {
        this.data = res.data.data;
      });
    },

    //4.点击某个一级分类，查询对应二级分类
    searchOne(subjectParentId, index) {
      //把传递index值赋值给oneIndex，为了active样式生效
      this.oneIndex = index;
      this.twoIndex = -1;
      this.searchObj.subjectId = "";
      this.subSubjectList = [];
      //把一级分类点击id值，赋值给searchObj
      this.searchObj.subjectParentId = subjectParentId;
      //点击某个一级分类进行条件查询
      this.gotoPage(1);

      //拿着点击一级分类id和所有一级分类作比较
      //如果id相同，从一级分类里面获取对应的二级分类
      for (let i = 0; i < this.subjectNestedList.length; i++) {
        //获取每个一级分类
        var oneSubject = this.subjectNestedList[i];
        //比较id是否相同
        if (subjectParentId == oneSubject.id) {
          //从一级分类里面获取二级分类
          this.subSubjectList = oneSubject.children;
        }
      }
    },

    //5.点击某个二级分类，查询对应课程信息
    searchTwo(subjectId, index) {
      //把index赋值，为了样式生效
      this.twoIndex = index;
      //把一级分类点击id值，赋值给searchObj
      this.searchObj.subjectId = subjectId;
      //点击某个二级分类进行条件查询
      this.gotoPage(1);
    },
    //6 根据销量排序
    searchBuyCount() {
      //设置对应变量值，为了样式生效
      this.buyCountSort = "1";
      this.gmtCreateSort = "";
      this.priceSort = "";

      //把值赋值到searchObj
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      //调用方法查询
      this.gotoPage(1);
    },
    //7.最新排序
    searchGmtCreate() {
      //设置对应变量值，为了样式生效
      this.buyCountSort = "";
      this.gmtCreateSort = "1";
      this.priceSort = "";

      //把值赋值到searchObj
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      //调用方法查询
      this.gotoPage(1);
    },
    //8.价格排序
    searchPrice() {
      //设置对应变量值，为了样式生效
      this.buyCountSort = "";
      this.gmtCreateSort = "";
      this.priceSort = "1";

      //把值赋值到searchObj
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      //调用方法查询
      this.gotoPage(1);
    },
  },
};
</script>


<style scoped>
.active {
  background: #bdbdbd;
}

.hide {
  display: none;
}

.show {
  display: block;
}
</style>